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34 Cards in this Set

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Astronomy
The study of celestial objects, space, and the physical universe as a whole.

The study of celestial objects, space, and the physical universe as a whole.

Seasons
The four divisions of the year (spring, summer, autumn, and winter)

The four divisions of the year (spring, summer, autumn, and winter)



Equinox
The time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length

The time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length

Solstice
Either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon

Either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon

Tides
Alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.

Alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.

Neap tide
A tide just after the first or third quarters of the moon when there is the least difference between high and low water.

A tide just after the first or third quarters of the moon when there is the least difference between high and low water.

Spring tide
A tide just after a new or full moon, when there is the greatest difference between high and low water.

A tide just after a new or full moon, when there is the greatest difference between high and low water.

Phases of the moon
As the moon circles the Earth, the shape of the moon appears to change; this is because different amounts of the illuminated part of the moon are facing us.

As the moon circles the Earth, the shape of the moon appears to change; this is because different amounts of the illuminated part of the moon are facing us.

Waxing
When you see the moon as a slim crescent - in the west after sunset - it's a waxing moon

When you see the moon as a slim crescent - in the west after sunset - it's a waxing moon

Waning
Waning Moon means the moon is decreasing in size, moving from the Full Moon towards the New Moon.

Waning Moon means the moon is decreasing in size, moving from the Full Moon towards the New Moon.

Gibbous
Convex at both edges, as the moon when more than half full.

Convex at both edges, as the moon when more than half full.

Crescent
A crescent moon is part way between a half moon and a new moon, or between a new moon and a half moon.

A crescent moon is part way between a half moon and a new moon, or between a new moon and a half moon.

Solar eclipse
An eclipse in which the sun is obscured by the moon.

An eclipse in which the sun is obscured by the moon.

Lunar eclipse
Aan eclipse in which the moon appears darkened as it passes into the earth's shadow.

Aan eclipse in which the moon appears darkened as it passes into the earth's shadow.

Rotation
The action of rotating around an axis or center.

The action of rotating around an axis or center.

Revolution
An instance of revolving.

An instance of revolving.

Axis
an imaginary line about which a body rotates.

an imaginary line about which a body rotates.

Gravitational force
Forces of attraction.  It's like the Earth pulling on you and keeping you on the ground. That pull is gravity at work.

Forces of attraction. It's like the Earth pulling on you and keeping you on the ground. That pull is gravity at work.

satellite
An artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.

An artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.

Debris
Space debris, also known as orbital debris, space junk and space waste, is the collection of defunct objects in orbit around Earth.

Space debris, also known as orbital debris, space junk and space waste, is the collection of defunct objects in orbit around Earth.

Astroid
A small rocky body orbiting the sun.

A small rocky body orbiting the sun.

Planet
A celestial body moving in an elliptical orbit around a star.

A celestial body moving in an elliptical orbit around a star.

Atmosphere
The envelope of gases surrounding the earth or another planet.

The envelope of gases surrounding the earth or another planet.

Astronomical unit
A unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.

A unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.

Gas giants
A large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune.

A large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune.

terrestrial planets
 The inner planets closest to the Sun.

The inner planets closest to the Sun.

Meteors
A meteor is the flash of light that we see in the night sky when a small chunk of interplanetary debris burns up as it passes through our atmosphere. "

A meteor is the flash of light that we see in the night sky when a small chunk of interplanetary debris burns up as it passes through our atmosphere. "

Comets
A celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.

A celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.

International Space Station
The International Space Station is a large spacecraft. It orbits around Earth. It is a home where astronauts live.

The International Space Station is a large spacecraft. It orbits around Earth. It is a home where astronauts live.



NASA
The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.

The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.

Hubble telescope
The Hubble Space Telescope is a large telescope in space.

The Hubble Space Telescope is a large telescope in space.

Space probes
An unmanned exploratory spacecraft designed to transmit information about its environment.

An unmanned exploratory spacecraft designed to transmit information about its environment.

galaxies
A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

Solar system
The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.

The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.